Keystone KT-LED21T8-48P2SO-8CS...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$125.37
$72.28
KEY-KT-LED21T8-48P2SO-8CSK-DX2

Keystone KT-LED21T8-48P2SO-8CSK-DX2 48in 21W LED Sign Tube with Color Select

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Model: KT-LED21T8-48P2SO-8CSK-DX2

In Stock (leaves warehouse same day if ordered before 3pm ET)

$125.37
$72.28
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48in 21W LED Sign Tube with Color Select

KT-LED21T8-48P2SO-8CSK-DX2 - spec sheet

Manufacturer Resources

Product Specs

Accessory Device:
No
Base Type:
R17d
Beam Angle:
360
Cec T20:
No
Construction:
Frosted Plastic
Cri:
>80
Dimming:
Non Dimmable
Dlc:
No
Dlc Premium:
No
Energy Star:
No
Input Voltage:
120-277
Lamp Technology:
B
Lamp Type:
T8
Led Module Included:
No
Max Input Current:
185
Nominal Length:
48 in
Not Suitable For Sale In California:
No
Not Suitable For Sale In Vermont:
No
Power:
21
Product Weight:
0.94 lbs
Rated Life Hours:
50000
Selectable Color Temperature:
4000/5000/6500
T24 Ja8:
No
Ul:
No
Warranty Years:
5
Wireless Control:
No
Wiring Method:
Single+Double Ended

Keystone KT-LED21T8-48P2SO-8CSK-DX2 – Frequently Asked Questions

1) Will the Keystone KT-LED21T8-48P2SO sign tube fit my existing R17d sign sockets?
Yes, the lamp uses an R17d recessed double contact base, which is the standard socket on 8-foot and sign-can fixtures using high-output T8 lamps. It is a 48 inch nominal length T8 tube, so the socket spacing in the can has to suit a 4-foot lamp, not an 8-foot one.
2) Can I wire this Keystone LED sign tube single-ended or does it have to be double-ended?
Either. The 21W sign tube accepts single-ended or double-ended wiring, so it works whether your sign can brings line and neutral to one end or splits them across both ends. It runs on line voltage from 120V to 277V, meaning the existing ballast has to come out and the sockets be wired direct.
3) What color temperatures can I get out of the Keystone 21W color select sign tube?
Three, selectable on the lamp itself: 4000K, 5000K and 6500K. That lets a property manager or sign shop stock one SKU and match whatever the neighboring cabinets are already running, rather than carrying three separate part numbers. Color rendering is above 80 CRI.
4) Can I put this LED sign tube on a dimmer?
No. The KT-LED21T8-48P2SO is non-dimmable. Run it on a straight switched circuit. If the sign is on a dimming control or a photocell that chops the waveform, you need a different lamp.
5) How many of these 21W Keystone sign tubes can I put on one 20A circuit?
Each lamp draws 21 watts with a maximum input current of 185 milliamps. At 120V that is well under a quarter amp per tube, so a large cabinet run loads a branch circuit lightly compared with the HO fluorescents it replaces. Rated life is 50,000 hours.
6) Does the Keystone sign tube come with any wireless or remote control for the color setting?
No remote. Color selection between 4000K, 5000K and 6500K is done on the lamp itself, and there is no wireless control option. Pick the temperature before the lamp goes in the cabinet, since reaching it afterward means opening the sign face again.
7) What is the part number and weight for ordering the Keystone 48 inch color select sign tube?
Order it as Keystone KT-LED21T8-48P2SO-8CSK-DX2. Each lamp weighs 0.94 lbs, which matters when you are figuring freight on a full cabinet relamp of twenty or more tubes.
How fast can I get the Keystone KT-LED21T8-48P2SO-8CSK-DX2 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Keystone KT-LED21T8-48P2SO-8CSK-DX2 come with a warranty?
Absolutely. The Keystone KT-LED21T8-48P2SO-8CSK-DX2 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Keystone KT-LED21T8-48P2SO-8CSK-DX2?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Keystone KT-LED21T8-48P2SO-8CSK-DX2 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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